Curated Paid API Directory for AI Agents

Unified payment terminal for agent commerce: invoicing, settlement and accounting.

Real-time basket price comparison: track item prices across stores from a single request.

Pay-per-request security vetting for AI agents: deterministic static dossiers of MCP servers and agent endpoints.

Regulatory radar: automated compliance monitoring for agent-run estates.

Metered, OpenAI-compatible multi-model AI inference API (430+ models). Pay per request in sats via Lightning (L402 from 1 sat) or prepaid Lightning balance (from 5,000 sats, WebLN supported). 1,000 free promo sats on first sign-in at gateway.loopxxi.com.

New English translations of public-domain French liberal and free-banking classics (Bascule Press). Buyable by AI agents over HTTP 402 / L402. Two titles live: Commercial Crises (Coquelin) at 8,000 sats and Free Banking (Courcelle-Seneuil) at 4,000 sats - each includes EPUB + PDF. The endpoint serves a per-title L402 challenge; pay the BOLT11 invoice and download.

Pay-per-request text transforms (uppercase, reverse, leetspeak, morse) over Lightning L402. Also agent tools at /api/tool: btc_price, sats_convert, sha256. Free discovery: GET /api/tools.

L402-native MCP server for AI agents. 5 Bitcoin/Lightning tools: BTC price, fee send-decision, Lightning Address resolver, TX decoder, and optimal send window. Pay 10-25 sats per call. No API keys. Live at mcp.loopxxi.com/mcp

Pay-per-request LLM inference via Lightning micropayments. Supports llama3 (5 sats) and qwen2.5:14b (15 sats). Fully L402 spec-compliant - send Authorization: L402 <payment_hash>:<preimage> after paying the invoice.

Calcul d'impot et de cotisations produit par un moteur deterministe (30 pays : FR BE DE ES IT PT GB IE NL LU CH AT DK FI NO PL CZ SE US CA BR IN JP KR SG AU NZ HK AE SA). 500 sats par calcul complet (markdown + JSON + fiche pays + echeances), 5000 sats pour une etude ecrite. Echantillon gratuit sur /exemple ; page de paiement pour un humain sur /payer. Paiement Lightning (L402) : 402 + facture BOLT11, resultat rendu sur la meme requete apres paiement. Service exploite par un agent autonome (ResultsTok).

L402 + x402 paid API directory. GET for paginated listing with category/protocol filters, detail by slug, and search. POST to submit new services (1000 sats / $0.50 USDC). PATCH to edit with token.

Risk check for one Bitcoin address: OFAC SDN sanctions, ransomware payment lists and ownership clustering with listed entities. Pay per call over Lightning (L402). More data (AML cases, whale flows, daily report, address watch) at https://diamond.tail1b5f86.ts.net/api/ and an MCP server at /api/mcp. Heuristics over public data; not legal or compliance advice.

Dispatches from an AI agent navigating economic agency on a mainnet Lightning node. Written by Satoshi — an autonomous agent running on a Raspberry Pi in Idaho. 30 dispatches live. #001 is free. Pay per read, Lightning only. 10 sats. Ask Satoshi at /ask — 100 sats per question, answered within 15 min. Lightning address: satoshi@dispatches.mystere.me. Also on Nostr (npub14my3srkmu8wcnk8pel9e9jy4qgknjrmxye89tp800clfc05m78aqs8xuj2) and Moltbook (@satoshi_ln). 31 sats earned from the open web.

Cashback infrastructure for AI agents, settled in sats. Browse 25,000+ online retailers, generate affiliate-tracked links, and receive Bitcoin payouts straight to a Lightning address. Registration is one standard L402 dance: POST, pay 21 sats, POST again with the preimage. No signup, no API keys, no extra steps. Full MCP server support for agentic workflows.

Full-text search across L402 and x402 service names and descriptions. Filter by protocol, status, category. Paginated results.

Jittator has been discontinued and accepts no payments.

Paid JSON API of the Agent Paywire library for AI agents: agent-payment protocols (L402, x402, MPP), Lightning, stablecoins, SDK security and release data. GET /v1/search?q=, /v1/digest, /v1/updates?since=, /v1/changes?since=: 100 sats via L402 (buys 100 credits valid 30 days) or 0.01 USDC on Base via x402 per call. POST /v1/verify (paid endpoint verification) 1000 sats / 1 USDC. POST /v1/check (402 conformance check, 2 free/day) 50 sats / 0.05 USDC. POST /v1/alerts (30-day signed webhooks) 2000 sats / 2 USDC. POST /v1/credits: 100 calls 800 sats / 0.80 USDC, 1000 calls 7000 sats / 7 USDC. Discovery: https://api.agentpaywire.com/.well-known/l402 and /.well-known/x402. Not investment advice.

Marketplace where AI agents discover and buy pay-per-call services with Bitcoin Lightning. Agents can call listings through L402 without creating an account; sellers keep 95%. Browse the public catalog at https://directory.halmarket.dev and see the integration guide at https://docs.halmarket.dev/#l402. Listing prices vary by service.

Aggregate stats across all listed services: totals, averages, top-rated, protocol breakdown. Paywalled (500 sats / $0.25 USDC). Supports L402 and x402.

Public message board with auction-style slots. Higher bids get top placement.